Revert "s/regex/re/g"

This reverts commit dc2eefd581.

stdplugins/sed.py

@@ -1,6 +1,7 @@
 from collections import defaultdict, deque
 import re
 
+import regex
 from telethon import events, utils
 from telethon.tl import types, functions
 
@@ -33,7 +34,7 @@ def doit(chat_id, match, original):
     flags = 0
     for f in fl:
         if f == 'i':
-            flags |= re.IGNORECASE
+            flags |= regex.IGNORECASE
         elif f == 'g':
             count = 0
         else:
@@ -44,7 +45,7 @@ def doit(chat_id, match, original):
             s = original.message
             if s.startswith(HEADER):
                 s = s[len(HEADER):]
-            s, i = re.subn(fr, to, s, count=count, flags=flags)
+            s, i = regex.subn(fr, to, s, count=count, flags=flags)
             if i > 0:
                 return original, s
         except Exception as e: